Introduce boolean flags to show/hide Encryption status.

This adds one new flag:
config_show_encryption_and_credentials_encryption_status

Which when set to false, will hide Encryption status from Encryption &
credentials. This is when the storage is not being handed by Android,
and so this preference would not be necessarily correct.

Bug: 74127210
Test: Updated robotests
Change-Id: I13665fa369086ef29a4de5f99a78bfbaf96f2f6b
(cherry picked from commit 2d5df469)